摘要
In order to improve the lifetime of continuous casting,ZrO_2-MoSi_2 composite powder used for plasmaspraying was prepared via spray drying and vacuum sintering.The microstructure and characteristics of the powder were investigated by particle size analysis,scanning electron microscopy and X-ray diffraction,respectively.The results show that the average viscosity and settlement rate are 60.43 mPas and 1.86%,respectively,when adding ammonium polyacrylate as a dispersant and polyvinyl alcohol as a binder.The powder obtained at the solid content of 70 wt.%,the dispersant amount of 1wt.%,the binder of 10 wt.%,and the sintering temperature of 1200 "C has the spherical agglomerate and a moderate size,which can be melted on the composite coating surface with a good compactness via plasma-spraying.
In order to improve the lifetime of continuous casting, ZrO2-MoSi2 composite powder used for plasma- spraying was preparedvia spray drying and vacuum sintering. The microstructure and characteristics of the powder were investigated by particle size analysis, scanning electron microscopy and X-ray diffraction, respectively. The results show that the average viscosity and settlement rate are 60.43 mPa·s and 1.86%, respectively, when adding ammonium poly-acrylate as a dispersant and polyvinyl alcohol as a binder. The powder obtained at the solid content of 70wt.%, the dis-persant amount of 1wt.%, the binder of 10wt.%, and the sintering temperature of 1200℃ has the spherical agglomerate and a moderate size, which can be melted on the composite coating surface with a good compactnessvia plas-ma-spraying.
